How do you create a yes no boolean field in SQL server

Question

What is the best practice for creating a yes no i e  Boolean field when converting from an access database or in general

User · Answer

There are already answers saying use of Bit. I will add more to these answers.

You should use bit for representing Boolean values.

Remarks from MSDN article.

Bit can take a value of 1, 0, or NULL.

The SQL Server Database Engine optimizes storage of bit columns. If there are 8 or less bit columns in a table, the columns are stored as 1 byte. If there are from 9 up to 16 bit columns, the columns are stored as 2 bytes, and so on.

The string values TRUE and FALSE can be converted to bit values: TRUE is converted to 1 and FALSE is converted to 0.

Converting to bit promotes any nonzero value to 1.

Reference

Note: It is good practice to keep values as 1 and 0 only with data type `NOT NULL`

As Bit have values 1, 0 and NULL. See truth table for this. So plan values accordingly. It might add confusion by allowing NULL value for bit data type.

Reference

User · Answer

The equivalent is a BIT field   In SQL you use 0 and 1 to set a bit field  just as a yes no field in Access   In Management Studio it displays as a false true value  at least in recent versions    When accessing the database through ASP NET it will expose the field as a boolean value

User · Answer

You can use the BIT field  To create new table   CREATE TABLE Tb Table1   ID              INT  BitColumn       BIT DEFAULT 1     Adding Column in existing Table   ALTER TABLE Tb Table1 ADD BitColumn  BIT DEFAULT 1   To Insert record   INSERT Tb Table1 VALUES 11 0

User · Answer

You can use the data type bit  Values inserted which are greater than 0 will be stored as  1   Values inserted which are less than 0 will be stored as  1   Values inserted as  0  will be stored as  0   This holds true for MS SQL Server 2012 Express

User · Answer

You can use the BIT field   For adding a BIT column to an existing table  the SQL command would look like   ALTER TABLE table name ADD yes no BIT  If you want to create a new table  you could do  CREATE TABLE table name  yes no BIT

User · Answer

Sample usage while creating a table    ColumnName      BIT   NULL   DEFAULT 0

User · Answer

The BIT datatype is generally used to store boolean values  0 for false  1 for true

User · Answer

In SQL Server Management Studio of Any Version  Use BIT as Data Type   which will provide you with True or False Value options  in case you want to use Only 1 or 0 then you can use this method     CREATE TABLE SampleBit      bar int NOT NULL CONSTRAINT CK foo bar CHECK  bar IN  -1  0  1       But I will strictly advise BIT as The BEST Option  Hope fully it s help someone

User · Answer

You can use the bit column type

User · Answer

bit is the most suitable option  Otherwise I once used int for that purpose  1 for true  amp  0 for false

User · Answer

bit will be the simplest and also takes up the least space  Not very verbose compared to  Y N  but I am fine with it

[sql-server] How do you create a yes/no boolean field in SQL server?

Note: It is good practice to keep values as 1 and 0 only with data type `NOT NULL`

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[sql-server] How do you create a yes/no boolean field in SQL server?

Note: It is good practice to keep values as 1 and 0 only with data type NOT NULL

Examples related to sql-server

Examples related to boolean

Examples related to sqldatatypes

Note: It is good practice to keep values as 1 and 0 only with data type `NOT NULL`